Lab
Blood Urea Nitrogen
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Blood Urea Nitrogen
, BUN
Pathophysiology
Increases by 10-20 mg/dl/day if
Renal Function
absent
Serum Creatinine
is a better measure of
Renal Function
BUN is Protein dependent
High protein diet
Catabolism
BUN is reabsorbed at renal tubules
Prerenal Failure
Dehydration
Congestive Heart Failure
Postrenal Failure
Obstructive Uropathy
Increased BUN
Medications
Aminoglycoside
s
Diuretic
s
Lithium
Corticosteroid
s
Dehydration
Gastrointestinal Bleeding
Decreased Renal
Blood Flow
Shock
Congestive Heart Failure
Myocardial Infarction
Renal disease
Glomerulonephritis
Pyelonephritis
Diabetic Nephropathy
Urinary Tract Obstruction
Decreased BUN
Liver
disease
Poor nutrition
Overhydration
Third trimester of pregnancy
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